Product Description
Major Repair Kit for Welch 1374 - 1374PI - OEM Equivalent
Repair Kit for Welch - OEM Equivalent
OEM-equivalent replacement, not manufactured by Welch, supplied by Vacuum Pump Supply.
Compatible Pump Models
- 1374
What This Kit Includes
- Filters where included by kit configuration
- Vanes where included by kit configuration
- Gaskets and sealing components
- Seals and O-rings
- Bearings where included by kit configuration
When Should You Rebuild or Service the Pump?
- Reduced vacuum performance
- Slow pump-down times
- Oil leaks or worn sealing components
- Excessive exhaust smoke or oil mist
- Worn or damaged internal components
- Scheduled preventative maintenance interval reached
Complete Bill of Materials
| Part Number | Description | Qty |
|---|---|---|
| 412258 | Sleeve, Hardened-Welch, Duoseal, Part# 412258 | 1 |
| 618538A | Backer Valve, Welch, Duoseal, Part# 618538A | 1 |
| 4401200 | Steel Ball, Welch, Duoseal, Chemstar, 1373, 1374, Part# 4401200 | 1 |
| 412259 | Coil Spring, Welch, Duoseal, Part# 412259 | 1 |
| 411489 | Spring Holder, Welch, Duoseal, 1374, 1397, Part# 411489 | 2 |
| 411490 | Woodruff Key, Cut, Welch, Duoseal, Part# 411490 | 2 |
| 411488 | Compression Spring, Welch, Duoseal, Part# 411488 | 4 |
| 411487 | Welch Vane, 2nd Stage - Cast Iron, Part# 411487 | 2 |
| 411477 | Vane, 1st Stage - Cast Iron, Welch, Duoseal, 1374, 1397, Part# 411477 | 2 |
| 411401F-01 | Shaft Seal Kit, Welch, Duoseal, 1374, 1397, Part# 411401F-01 | 1 |
| 411304 | Spring, Welch, Duoseal, Part# 411304 | 2 |
| 411267 | Rubber Washer, Welch, Duoseal, Part# 411267 | 2 |
| 411266 | Washer, Tension, Welch, Duoseal, Models 1373, 1374, 1376, 1397, 1398, 1399, 1400, 1402, 1405, Part# 411266 | 2 |
| 411137 | Washer-Welch Duoseal, Part# 411137 | 3 |
| 411056 | Washer, Welch, Duoseal, 1374, 1397, 1400, Part# 411056 | 4 |
| 410992 | Pressure Relief Valve, Welch, Part# 410992 | 1 |
| 410716 | V-Belt, Welch, Duoseal, Part# 410716 | 2 |
| 410696 | Spring Holder, Welch, Part# 410696 | 1 |
| 411495 | Intake Cover Gasket-Welch Duoseal, Part# 411495 | 1 |
| 411496 | Case Gasket, Welch, Duoseal, 1374, 1397, Part# 411496 | 1 |
| 410055 | Spacer, Welch, Duoseal, Part# 410055 | 1 |
| 411507 | O-ring, 78.97 x 3.53 mm - Buna, Part# 411507. | 1 |
| 411508 | Valve Gasket, Welch, Duoseal, Part# 411508 | 1 |
| 411516 | Small Rotor Key, Welch, Duoseal, Part# 411516 | 1 |
| 412161 | Pressure Relief Valve, Part# 412161 | 1 |
| 412256 | Coil Spring - Welch Duoseal, Part# 412256 | 1 |
| 412257 | Sleeve, Hardened, Welch, Duoseal, 1374, 1397, Part# 412257 | 1 |
| 618539A | Flapper Valve, Welch, Duoseal, Part# 618539A | 1 |
Complete Welch Vacuum Pump Solutions
Vacuum Pump Supply stocks OEM-equivalent Welch repair kits, filters, vanes, gaskets, seals, bearings, and service parts for pump maintenance and rebuild work.
Welch Parts & Resources
Recommended Service Products
Why Buy from Vacuum Pump Supply?
- Vacuum pump specialists since 2006
- Over 15,000 vacuum pump parts and kits available
- OEM-equivalent replacement parts for hard-to-find vacuum pump models
- Fast shipping on stocked products
- Technical support from vacuum pump specialists
- Trusted by manufacturers, laboratories, universities, service companies, and maintenance teams
Frequently Asked Questions
Is this an OEM Welch product?
No. This is an OEM-equivalent product supplied by Vacuum Pump Supply.
What is the part number?
The part number is 1374PI.
Can Vacuum Pump Supply help identify the correct part?
Yes. If you are unsure whether this is the correct product for your pump, contact Vacuum Pump Supply with your pump model and any existing part numbers.
